SMuK 2021 – scientific programme

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P: Fachverband Plasmaphysik

P 5: Poster I

P 5.32: Poster

Tuesday, August 31, 2021, 14:00–16:00, P

Generalized Fluid Models for Edge Turbulence Simulations — •Christoph Pitzal, Andreas Stegmeir, and Frank Jenko — Max Planck Institute for Plasma Physics, Garching, Germany

Fluid models are a useful tool for simulations in the field of Plasma Physics. On the one hand, fluid models are less computationally intense than kinetic models. On the other hand, the models have limited predictive capabilities, since not all effects are captured, that are necessary to simulate a fusion device sufficiently. The effects which are not contained are primarily kinetic effects, which are lost due to the missing velocity space, e.g. Landau damping. Every fluid model introduces a hierarchy of moments, which connects a fluid moment with the next higher one and needs to be closed for the model to become applicable. Models with a collisional closure, as the Braginskii model [1], significantly overestimate for example the parallel heat conductivity due to the absence of Landau damping. By using particular closure approximations instead of the commonly used collisional closure the model can mimic certain kinetic effects, as first shown with Landau damping in [2]. The scope of this project is to study different kinetic effects and their applicability for current plasma fluid codes, such as GRILLIX [3]. Further steps will be the implementation of such a model and to compare the increase of fidelity and computational effort. [1] S. Braginskii and M. Leontovich Reviews of plasma physics, 1965. [2] G. W. Hammett and F. W. Perkins Phys. Rev. Lett., vol. 64, pp. 3019-3022, Jun 1990. [3] A. Stegmeir, A. Ross, T. Body, et al. Phys. Plasmas, vol. 26, p. 052517, 2019.